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href="/games/"><i class="fa-fw iconfont icon-youxi1 faa-shake animated-hover"></i><span> 游戏</span></a></li><li><a class="site-page" href="/galleryGroup"><i class="fa-fw iconfont icon-tuku faa-shake animated-hover"></i><span> 图库</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/messagepad/"><i class="fa-fw iconfont icon-ziyuan6 faa-shake animated-hover"></i><span> 留言板</span></a></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw iconfont icon-icon_xinyong_xianxing_jijin- faa-shake animated-hover"></i><span> 友情链接</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw iconfont icon-guanyuwomen faa-shake animated-hover"></i><span> 关于我</span></a></div></div><span class="close" id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></span></span></nav><div id="post-info"><h1 class="post-title">PR基础学习篇(二.PR相关基础知识)</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-07T09:53:36.000Z" title="发表于 2021-01-07 17:53:36">2021-01-07</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-01-11T06:13:28.373Z" title="更新于 2021-01-11 14:13:28">2021-01-11</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/%E8%A7%86%E9%A2%91%E5%89%AA%E8%BE%91/">视频剪辑</a></span></div><div class="meta-secondline"> <span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.8k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>8分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="PR基础学习篇-二-PR相关基础知识-："><a href="#PR基础学习篇-二-PR相关基础知识-：" class="headerlink" title="PR基础学习篇(二.PR相关基础知识)："></a>PR基础学习篇(二.PR相关基础知识)：</h1><blockquote>
<p>本篇文章主要是介绍PR使用过程中和视频音频等专业名词，能够更好的为我们在学习中提供便利，该内容可根据自身要求掌握。</p>
</blockquote>
<ul>
<li>回想我当时学PR只是单纯的喜欢刷B站的混剪视频，感觉很炫酷，就一门心思的跟着视频资料学习，往往都是跟着他们亲手做，但是很多设置或者操作只是知道怎么做，怎么用，但是不知道为什么，是神马。甚至有人问我：什么是帧，什么叫帧速率，什么叫方形像素，什么叫场序，什么叫预设，什么事序列……所以我们需要了解必要的专业名词的含义。</li>
</ul>
<ol>
<li><h2 id="基础参数设置："><a href="#基础参数设置：" class="headerlink" title="基础参数设置："></a>基础参数设置：</h2><ul>
<li><h4 id="时长："><a href="#时长：" class="headerlink" title="时长："></a>时长：</h4><ul>
<li><p>时长为视频时间的长度。基本单位为秒。但是在PR软件中，有更为精准的时间单位计算为帧，也就是把1秒分为若干份，一份就是一帧，一帧也就可以理解为一张图片。所以在PR软件中视频显示的时间长度表述为时：分：秒：帧 （若视频为25帧/S，则25帧时间向前递进1秒）。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/y10xjvGpzKx2.png" alt="PR中时长的表示"></p>
</li>
</ul>
</li>
<li><h4 id="帧："><a href="#帧：" class="headerlink" title="帧："></a>帧：</h4><ul>
<li><p>视频的基本单位之一，也是最小的一个基本单位。一帧也就可以理解为一张图片，相当于电影胶片上的每一格镜头，连续的帧就形成动画，如电视图象等。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/l*d3q6IU!IAA.jpg" alt="帧动画分解图"></p>
</li>
</ul>
</li>
<li><h4 id="帧速率："><a href="#帧速率：" class="headerlink" title="帧速率："></a>帧速率：</h4><ul>
<li><p>每秒播放帧的数量，单位是每秒多少帧，也就是fps。帧速率越高，视频越流畅。基本上，每秒24帧就很流畅了。不同格式的视频，帧速率不同，24，25，30。24FPS被视为“电影”帧速率的标准。30FPS广泛应用于北美洲、日本、南亚，25FPS是欧洲、中国的广播电视级标准，日本动画一般是24帧……帧速率是重要参数，最好不要乱选。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/2NJBC6zllAmP.png" alt="PR中的帧速率"></p>
</li>
</ul>
</li>
<li><h4 id="帧大小："><a href="#帧大小：" class="headerlink" title="帧大小："></a>帧大小：</h4><ul>
<li><p>帧（视频）的宽和高。宽和高用像素数量表示，一个像素可以理解为一个小方格。比如一段HD视频是<code>1920*1080</code>，就是宽1920个像素，高1080个像素，那么可以算出HD的一帧画面里包含<code>1920*1080=207</code>万个像素。<strong>帧尺寸越大，视频画面也就越大，像素数也越多。</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/baxRKcVceeTd.png" alt="PR中设置帧大小"></p>
</li>
</ul>
</li>
<li><h4 id="像素长宽比："><a href="#像素长宽比：" class="headerlink" title="像素长宽比："></a>像素长宽比：</h4><ul>
<li><p>每一个像素的长宽比，所以又叫长宽比。像素的小方格如果是正方形，那么像素比就是1.0，如果是长方形，通常是0-2之间的小数。正常选择：<strong>方形像素</strong>。</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/AF8KOCG1idGV.png" alt="PR中设置像素长宽比"></p>
</li>
</ul>
</li>
<li><h4 id="画面尺寸："><a href="#画面尺寸：" class="headerlink" title="画面尺寸："></a>画面尺寸：</h4><ul>
<li>画面尺寸：实际显示画面的宽和高。与帧尺寸相关的一个概念，比如一段视频帧尺寸是<code>1920*1080（1.0）</code>，括号内是像素比，我们知道每个像素都是正方形，我们就很容易知道这个视频实际显示出来就是<code>1920*1080</code>；另一段视频帧尺寸是<code>1440*1080（1.333）</code>，我们就能够算出宽是<code>1440*1.333=1920</code>，所以这个视频显示出来也是<code>1920*1080</code> 。<strong>有某些播放器不能正确识别视频的像素比，所以会导致某些视频显示变形</strong>，为了避免这种情况，我通常不会输出类似<code>1440*1080（1.333）</code>这样的视频，而是直接输出<code>1920*1080（1.0）</code>。</li>
</ul>
</li>
<li><h4 id="画面比例："><a href="#画面比例：" class="headerlink" title="画面比例："></a>画面比例：</h4><ul>
<li><strong>视频画面实际显示宽和高的比值。</strong>就是我们通常说的<code>16：9，4：3，2.35：1</code>等等。比如一个HD视频，画面尺寸是<code>1920*1080（1.0）</code>，那么他的画面比例就是<code>1920*1/1080=1.778=16：9 </code>。新手会遇到这样的一类问题，就是画面生成之后上下或者左右会出现黑边，<strong>这就要检查你的原始视频素材的画面比例和导出视频的画面比例是否一致了。</strong></li>
</ul>
</li>
<li><h4 id="场序（场）"><a href="#场序（场）" class="headerlink" title="场序（场）:"></a>场序（场）:</h4><ul>
<li>比较专业的一个概念，标清电视年代需要掌握，但是到高清逐行视频普及的今天用处已经不大。场分为高场（上场）、低场（下场）和无场。当视频的场序弄错的话，视频细节会产生大量的横纹，还有可能会抖动、模糊。所以，<strong>通常我会建立一个无场逐行的序列，最后也输出为无场，这样可以避免这一类的问题。</strong></li>
</ul>
</li>
<li><h4 id="隔行扫描、逐行扫描："><a href="#隔行扫描、逐行扫描：" class="headerlink" title="隔行扫描、逐行扫描："></a>隔行扫描、逐行扫描：</h4><ul>
<li><p><strong>隔行和逐行</strong>：分别用<code>i</code>和<code>p</code>来表示，也是从早期电视延伸出的概念，到今天了解不了解意义都不太大。逐行扫描的场序是无场，隔行扫描的场序就是高场或低场。他们之间可以简单换算，**<code>50i</code>相当于<code>25p</code><strong>，</strong>在pr实际使用的时候，我也通常建立25p的序列来制作50i的素材。但是现在基本都是逐行扫描了默认的。**</p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/S^3289dTssFD.png" alt="PR中场的设置"></p>
</li>
</ul>
</li>
<li><h4 id="深度："><a href="#深度：" class="headerlink" title="深度："></a>深度：</h4><ul>
<li><strong>指的是色彩深度。</strong>对于普通的RGB视频来说，8bit是最常见的，对应到pr， RGB是三个通道，乘上每个通道8bit，就是最常见的24bit。32bit一般是多了一个alpha通道，也就是蒙版mask。同理可知，12bit深度在pr里对应的是36bit，16bit深度对应的是48bit。</li>
</ul>
</li>
<li><h4 id="采样率："><a href="#采样率：" class="headerlink" title="采样率："></a>采样率：</h4><ul>
<li><p><strong>一般不用去管的参数，48000 Hz和44100 Hz用的最多。</strong></p>
<p><img src= "/img/loading.gif" data-lazy-src="https://gitee.com/he_chaoming/blog_tuchuang/raw/master/20210108/irXxhA!drpUj.png" alt="采样率"></p>
</li>
</ul>
</li>
<li><h4 id="声道："><a href="#声道：" class="headerlink" title="声道："></a>声道：</h4><ul>
<li>分为单声道、立体声；2声道、5.1声道；6声道和多声道；更多声道。<strong>声道是指声音在录制或播放时在不同空间位置采集或回放的相互独立的音频信号，所以声道数也就是声音录制时的音源数量或回放时相应的扬声器数量。</strong></li>
</ul>
</li>
<li><h4 id="声轨："><a href="#声轨：" class="headerlink" title="声轨："></a>声轨：</h4><ul>
<li><strong>一段视频里包含的不同的独立的声音轨道。</strong>可以理解为原来DVD里的中文轨道、英文轨道等等，他们彼此独立相互并不影响，可以在播放器里切换。</li>
</ul>
</li>
<li><h4 id="声音深度："><a href="#声音深度：" class="headerlink" title="声音深度："></a>声音深度：</h4><ul>
<li>和视频深度类似，也有16bit，24bit等等，pr都是支持的，一般来说用16bit就够了。</li>
</ul>
</li>
</ul>
<hr>
</li>
<li><h2 id="视频基本知识："><a href="#视频基本知识：" class="headerlink" title="视频基本知识："></a>视频基本知识：</h2><ul>
<li><h4 id="为什么导出的视频这么大？："><a href="#为什么导出的视频这么大？：" class="headerlink" title="为什么导出的视频这么大？："></a>为什么导出的视频这么大？：</h4><ul>
<li>画面的基础单位是像素，一帧画面里包含了很多像素，比如HD 25p的一帧画面就包含了200万个像素，一个像素又至少包含了RGB三个通道24bit的色彩数据信息，一秒钟画面又有25帧画面——当这些像素信息不压缩的时候，必然会产生海量数据，一秒钟未压缩的HD视频画面大约是150MB，这也解释了很多新手的问题——为什么我的视频会那么大？<strong>很有可能你的视频压缩选项里选择的是“未压缩”。</strong></li>
<li><strong>无压视频的好处是画面信息绝对精确，这在专业视频制作领域非常的重要。坏处就是占用巨大的硬盘资源，在视频播放和编辑的时候产生巨大的数据吞吐量，当你的电脑硬盘速度和接口速度不够牛比的时候，就会“卡顿”，而且也没办法通过网络分享给别人。</strong></li>
<li>所以，一般来讲，我们通常使用的视频基本都是经过压缩的。注意这里的压缩指的都是“有损压缩”，通过某些算法，把像素信息合并简化，产生比较少的数据。<strong>这些算法有很多种类，也就是所谓的“压缩格式”。电脑通过压缩格式把庞大的数据流压缩成很小的文件，当播放的时候，再通过逆向计算，把文件数据还原成视频的画面信息显示出来，这就是所谓的编码和解码</strong>。不同的压缩格式，效率和效果都不一样，但是都会造成一定的“损失”。越是优秀的压缩格式，占用的CPU资源越少，画面损失越小，文件尺寸越小。</li>
<li><strong>压缩视频的好处是能保证流畅播放的基础上足够的小，缺点当然是画面或多或少会产生损失，会占用一定的CPU资源。</strong></li>
</ul>
</li>
<li><h4 id="视频格式："><a href="#视频格式：" class="headerlink" title="视频格式："></a>视频格式：</h4><blockquote>
<p><strong>可以简单表述为视频文件的后缀名。</strong></p>
<p>常用有：<code>mp4、mov、avi、mpg、flv、mkv、wmv、rmvb、R3D、MXF、MTS</code>等等……一段视频里通常含有一条视频轨道和若干条音频轨道。我们可以把视频格式理解为一个容器，有的容器只能装特定类型的东西<code>rmvb、wmv</code></p>
<p>有的容器能装的种类多一些<code>mov、avi、mp4、mkv</code>，这里说的种类，就是不同的压缩格式。</p>
<p>常用视频格式：<strong>AVI、MOV、rmvb、FLV、mp4、3GP</strong>等。</p>
</blockquote>
<ol>
<li><strong>AVI</strong>:<ul>
<li>AVI这个由微软公司发布的视频格式，在视频领域可以说是最悠久的格式之一。AVI格式调用方便、图像质量好，压缩标准可任意选择，是应用最广泛、也是应用时间最长的格式之一。</li>
</ul>
</li>
<li><strong>MOV</strong>:<ul>
<li><strong>MOV即QuickTime影片格式</strong>，它是Apple公司开发的一种音频、视频文件格式，用于存储常用数字媒体类型。用于保存音频和视频信息,甚至WINDOWS7在内的所有主流电脑平台支持。</li>
</ul>
</li>
<li><strong>rmvb</strong>:<ul>
<li>RMVB是一种视频文件格式，其中的VB指Variable Bit Rate（可变比特率）。较上一代RM格式画面要清晰很多，原因是降低了静态画面下的比特率。</li>
</ul>
</li>
<li><strong>FLV</strong>:<ul>
<li>FLV是FLASH VIDEO的简称，FLV流媒体格式是一种新的视频格式。由于它形成的文件极小、加载速度极快，使得网络观看视频文件成为可能，它的出现有效地解决了视频文件导入Flash后，使导出的SWF文件体积庞大，不能在网络上很好的使用等缺点。</li>
</ul>
</li>
<li><strong>mp4</strong>:<ul>
<li><strong>MP4是一套用于音频、视频信息的压缩编码标准</strong>,MPEG-4格式的主要用途在于网上流、光盘、语音发送（视频电话），以及电视广播。</li>
</ul>
</li>
<li><strong>3GP</strong>:<ul>
<li>3GP是第三代合作伙伴项目计划.为3G UMTS多媒体服务定义的一种多媒体容器格式，主要应用于3G移动电话，但也能在一些2G和4G手机上播放。</li>
</ul>
</li>
</ol>
<hr>
</li>
<li><h4 id="码流"><a href="#码流" class="headerlink" title="码流:"></a>码流:</h4><ul>
<li>每秒占用的数据量，用<strong>kbps或mbps</strong>来表示。<strong>码流是视频清晰度的一个重要指标，同样的压缩格式，码流越大，生成的视频损失就越小，视频相对来说也越“清晰”。</strong></li>
</ul>
<hr>
</li>
<li><h4 id="平均码流、最大码流"><a href="#平均码流、最大码流" class="headerlink" title="平均码流、最大码流:"></a>平均码流、最大码流:</h4><ul>
<li><strong>平均码流是决定视频文件大小的唯一标准。</strong>不同画面因为复杂程度不一样所以压缩出来的码流也是不一样的，所以就产生出可变码流的概念。故名思议，平均码流就是可变码流的平均数，平均码流除以8，就是每秒实际文件的大小。当我们知道视频的码流和时长之后，就可以粗略的估算出最终生成文件的大小。而最大最小码流决定了可变码流的变化范围。<strong>在pr中，一般只设定平均码流和最大码流，最大码流我一般设定为平均码流的1.5倍-2倍。</strong></li>
</ul>
</li>
</ul>
</li>
</ol>
<hr>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="mailto:undefined">六根清静</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://liugenqingjing2.coding.me/2021/01/07/PR%E5%9F%BA%E7%A1%80%E5%AD%A6%E4%B9%A0%E7%AF%87-%E4%BA%8C-PR%E7%9B%B8%E5%85%B3%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86/">https://liugenqingjing2.coding.me/2021/01/07/PR基础学习篇-二-PR相关基础知识/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://liugenqingjing2.coding.me" target="_blank">小何blog (记录美好)</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" 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v-html="newpostvue.content"></div></div></div></div><div class="card-widget card-shuo"><div class="card-content" style="height:auto;min-height:280px;"><div class="item-headline"><i class="fas fa-comments"></i><span>&#x8BF4;&#x8BF4</span><a id="shuovisualchange" style="cursor:pointer;float:right" onclick="shuovisualchange()">编辑</a></div><div id="artitalk_main" style="width:100%;height:100%;padding:10px"></div></div></div><div class="sticky_layout"></div><div class="card-widget card-history"><div class="card-content"><div class="item-headline"><i class="fas fa-paw fa-spin"></i><span>那年今日</span></div><div id="history-news" style="height: 100px;overflow: hidden;"><div id="history-card"></div></div></div></div><div class="card-widget card-announcement"><div class="card-content"><div class="item-headline"><i class="fas fa-bullhorn card-announcement-animation"></i><span>公告</span></div><div class="announcement_content">大学生一枚，软件工程，想做全栈攻城狮，哈哈，有兴趣可以加 QQ:484695754 (也可以点上面的logo)，一起交流学习</div></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="card-content"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#PR%E5%9F%BA%E7%A1%80%E5%AD%A6%E4%B9%A0%E7%AF%87-%E4%BA%8C-PR%E7%9B%B8%E5%85%B3%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86-%EF%BC%9A"><span class="toc-number">1.</span> <span class="toc-text">PR基础学习篇(二.PR相关基础知识)：</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%9F%BA%E7%A1%80%E5%8F%82%E6%95%B0%E8%AE%BE%E7%BD%AE%EF%BC%9A"><span class="toc-number">1.1.</span> <span class="toc-text">基础参数设置：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%97%B6%E9%95%BF%EF%BC%9A"><span class="toc-number">1.1.0.1.</span> <span class="toc-text">时长：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B8%A7%EF%BC%9A"><span class="toc-number">1.1.0.2.</span> <span class="toc-text">帧：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B8%A7%E9%80%9F%E7%8E%87%EF%BC%9A"><span class="toc-number">1.1.0.3.</span> <span class="toc-text">帧速率：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B8%A7%E5%A4%A7%E5%B0%8F%EF%BC%9A"><span class="toc-number">1.1.0.4.</span> <span class="toc-text">帧大小：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%83%8F%E7%B4%A0%E9%95%BF%E5%AE%BD%E6%AF%94%EF%BC%9A"><span class="toc-number">1.1.0.5.</span> <span class="toc-text">像素长宽比：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%94%BB%E9%9D%A2%E5%B0%BA%E5%AF%B8%EF%BC%9A"><span class="toc-number">1.1.0.6.</span> <span class="toc-text">画面尺寸：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%94%BB%E9%9D%A2%E6%AF%94%E4%BE%8B%EF%BC%9A"><span class="toc-number">1.1.0.7.</span> <span class="toc-text">画面比例：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%9C%BA%E5%BA%8F%EF%BC%88%E5%9C%BA%EF%BC%89"><span class="toc-number">1.1.0.8.</span> <span class="toc-text">场序（场）:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%9A%94%E8%A1%8C%E6%89%AB%E6%8F%8F%E3%80%81%E9%80%90%E8%A1%8C%E6%89%AB%E6%8F%8F%EF%BC%9A"><span class="toc-number">1.1.0.9.</span> <span class="toc-text">隔行扫描、逐行扫描：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E6%B7%B1%E5%BA%A6%EF%BC%9A"><span class="toc-number">1.1.0.10.</span> <span class="toc-text">深度：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E9%87%87%E6%A0%B7%E7%8E%87%EF%BC%9A"><span class="toc-number">1.1.0.11.</span> <span class="toc-text">采样率：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A3%B0%E9%81%93%EF%BC%9A"><span class="toc-number">1.1.0.12.</span> <span class="toc-text">声道：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A3%B0%E8%BD%A8%EF%BC%9A"><span class="toc-number">1.1.0.13.</span> <span class="toc-text">声轨：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%A3%B0%E9%9F%B3%E6%B7%B1%E5%BA%A6%EF%BC%9A"><span class="toc-number">1.1.0.14.</span> <span class="toc-text">声音深度：</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%A7%86%E9%A2%91%E5%9F%BA%E6%9C%AC%E7%9F%A5%E8%AF%86%EF%BC%9A"><span class="toc-number">1.2.</span> <span class="toc-text">视频基本知识：</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%B8%BA%E4%BB%80%E4%B9%88%E5%AF%BC%E5%87%BA%E7%9A%84%E8%A7%86%E9%A2%91%E8%BF%99%E4%B9%88%E5%A4%A7%EF%BC%9F%EF%BC%9A"><span class="toc-number">1.2.0.1.</span> <span class="toc-text">为什么导出的视频这么大？：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E8%A7%86%E9%A2%91%E6%A0%BC%E5%BC%8F%EF%BC%9A"><span class="toc-number">1.2.0.2.</span> <span class="toc-text">视频格式：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E7%A0%81%E6%B5%81"><span class="toc-number">1.2.0.3.</span> <span class="toc-text">码流:</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#%E5%B9%B3%E5%9D%87%E7%A0%81%E6%B5%81%E3%80%81%E6%9C%80%E5%A4%A7%E7%A0%81%E6%B5%81"><span class="toc-number">1.2.0.4.</span> <span class="toc-text">平均码流、最大码流:</span></a></li></ol></li></ol></li></ol></li></ol></div></div></div><div class="card-widget card-recent-post"><div class="card-content"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/03/21/Node-js%E5%AD%A6%E4%B9%A0-%E4%BA%8C%E5%8D%81%E4%B8%89-%E8%B7%A8%E5%9F%9F%E4%BB%8B%E7%BB%8D%E5%92%8CJSONP%E4%BB%8B%E7%BB%8D/" title="Node.js学习(二十三.跨域介绍和JSONP介绍)"><img 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